Typo: Bad UUIDv7 reference in Section 4.4

[kyzer-davis]

Need to fix still,

4.4. UUIDv7 Layout and Bit Order

Old:
The format for the 16-octet, 128-bit UUIDv6 is shown in Figure 2

New:
The format for the 16-octet, 128 bit UUIDv7 is shown in Figure 2

Reported by Blachly, James James.Blachly@osumc.edu on the mailer

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Already fixed, under #14, found by Ville Skyttä ville.skytta@iki.fi on the mailer

Old
The 4 bit UUIDv8 version (0111)

New:
The 4 bit UUIDv7 version (0111)